futhark-pkg: add should note when no change is performed.
futhark-pkg: add should note when no change is performed.

diku-dk/futhark,diku-dk/futhark,diku-dk/futhark,diku-dk/futhark,HIPERFIT/futhark,HIPERFIT/futhark,HIPERFIT/futhark,diku-dk/futhark